Variable sensitivity control valve



July 3l, 1945. R. R. PROCTQR VARIABLE SENSITIVITY COTROL VALVE Filed June `20, 1942 rLa Y Y Snvntr, @ALP/1 Q. ppocroz (Ittorneg fir Patentedilly 3 1, 1945 UNITED STATES PATENT OFFICE 1 380,105 VARIABLE sl-:Nsrrrvrrv ooN'raoL vALvr:v anni a. Proctor, Glendale, cani.

' lApplication J une 20, 1942, Serial No. 447,779

is imparted to the hydraulic motor or cylinder 12 Claims.

My invention relates in general to pressure systems, and inparticular to an adjustable selector or control valve for. use in hydraulic, fluid, gas and vapor pressure-or vacuumsystems for controlling or obtaining universal aiming movements of guns. universal movement of gun turrets, movements o1' cranes, earth loading and moving machinery. tractors, trucks, tanks, valves and movement of various operative parts, in different types of mechanisms, including the control and movement of control surfaces of-aircrait. The terms, hydraulic," and iluids" as used hereafter shall be understood to include any means of transmitting force or energy by use of lluids, gases or vapors under pressure or vacuum.

It is an object of my invention to provide a simple hydraulic system wherein a control member, such as a lever, is moved in accordance with the movement desired for an operator part or mechanism by a hydraulic motivating means, this hydraulic system including an adjustable valve operated by the control member so as to control thev delivery of motivating uid from the source of iluid under pressure to the motivating means.

It is an object of the invention to provide av control valve fo:- use in hydraulic systems, this from the part operated by the motor or cylinder.

The invention is especially useful in hydraulic systems wherein a movable control member is connected to a, part-Which is t be moved or' operated so as to transmit thereto a force depending upon lthe iorce applied to th'e control member, and supplementary force applying meansemploying hydraulic fluid controlled by movement of the control member to add a booster force to the force exerted by the control member.

Further objects of the. invention include the provision of a simple arrangement of parts A whereby adjustment of the valve may be accomcontrol valve having means for adjusting its cooperating parts. A feature ofA this valve is that a number o! adjustments may be made therein while the device is installed in a hydraulic system' in which it is to be used, Ithese adjustments being made to suit th'e needs of the particular job to which the valve has been applied or to meet the provide a valve of this character wherein its partsmay be adjusted to vary the sensitiveness of its operation while the valve is connected into a hydraulic system, and without the necessity of dis.- assembling the valve structure.

A further object of fthe invention is to provide a valve of the albove general character having there-- in chambers wherein fluid pressure may be employed to produce a reacting force against the operating lever, commonly referred to as load fee or to transmit to the manually controlled operating lever a force corresponding to; but

larger or smaller than the ,"kick back i'orce which y the speciiication.

plished, and also the provision of a novel form of closure member in the valve, which closure member constributes to the simplicity of the arrangement, whereby the adjustment of the valve structure is obtainable.

The adjustment in the kvalve structure for changing the relative positions of the valve clo- .sures is provided for the purpose of securing variations in the rate of pressure changesv in the service ports and operating mechanisms to which the valve is connected, as the valve is operated, and/or variations in pressure relationships between inilowports, service ports, and outilow ports. p

Further objects and advantages of` th'e invention will be brought out in thefollowing part oi Referring to the drawing which is for illustrative purposes only,

Fig. l is a schematic view showing system embodying my invention.

Fig. 2 is an enlarged sectional view of the control valve disclosed in Fig. 1. v f

Fig. k3 is a cross section taken the line 3--3 of Fig. `2. 1

4 is a fragmentary.` perspective view of one of the closures iorxning'a part of the valve means disclosed in Fig. 2.

`as indicated by Fig. 5 is afragmentaxy perspective view showing kan alternative form -oi closure.

The hydraulic system'shown infFig. `1 includes a, control member shown as a lever Ill swingable upon a pin Il, this lever. Ill comprising a lower f section IZ'and an upper or handle section I3 hinged as shown at I4 and having cooperating shoulders l5 for limiting movement of the upper Section I3 relatively tothe lower section l2. A spring I6, mounted at I'Lgn the lower section l2, engages the upper section Il at Il, this spring tending to hold the 'upper section I3 in alignment with the lower section I2.

an hydraulic section i2 of the lever I9.

'I'he lever III has means 21 at its vlower end connected to the cablev loop 22 whereby force and motion may be transmitted. A control valve 28 is mounted upon the lower ing means 29 extending therefrom for engagement by a lever 3|) which projects from the lower It has a valve actuatportion of -the upper or handle section I3 of the lever III. The source of fluid pressure is shown as a pump 3 I connected by pressure piping 32 with an ,intermediate portion ofthe control valve body. Return piping '32 leads from the selector valve to a reservoir 34 which is connected to the4 pump by piping 35. When the handle I3 is moved in rightward direction, the lever 3U will be 'swung downward and the selector valve 28 will be actuated so as to deliver duid through the delivery piping 36 to the rightward end of the cylinder 25, thereby moving the piston-25 leftward in the same direction as the lower en d of the lever III is moved by pressure applied rightward to the handle. I3, the force of the uid under pressure in the rightward end of -the cylinder 2l supplmenting the pressure applied to the cable loop 22 by the lower end of lthe lever ill. When the handle Ai3 is swung leftward from the position in which-it is shownin Fig. 1, the lever 30 will be raised and the selector valve 28 will be actuated so as to deliver fluid under. pressure through delivery piping 31 to the leftward end of the cylinder 25, thereby applying a. rightward motivating force to the piston 25 and the cable loop 22 to which it is connected.`

As shown in Fig. 2, the control valve y29 comprises a hollow body 39 preferably of' cylindric form and having upper and lower end walls 39 and 49. The body 33 has an intermediate port the delivery piping 3l tothe rightwardendofthe- 4I and ports k42 spaced on opposite sides thereof.

These ports 42 may be referred to as end ports by reason of their placement nearer the ends of the body 39. The pressure piping 32 is shown connected to the intermediate port 4I and the suitable outline connected by a passage 49, this opposed relation of the ports 45 substantially balancing the fluid pressures radially applied through the ports against valve means which will be hereinafter described. -The service port means 44 includes diametrally opposed ports 41 conf nected by apassage 42. -It will be understood that the illustration showing diametrically opposed serv'lce' ports is for descriptive purposes only, three, four, five, or more, service ports, connected by passages 49 to service Dort means 43 and 44 may be desirable in certain instances.

The direction of movement'oi' the valve actuating meansll in the normaloperation of the ment of the handle llrelatively to the lower part I2 of the lever Il. The valve means 4I includes a valve closure 49 for cooperation with the ports 45 anda valve closure 5I for cooperation with the ports 41. The closures 49 and 50 are shown in neutral position wherein they are substantially centralized with relationto the ports 45 and 41. Each of the closures. and 50, as shown in Figs. 2 and 4, varies in dimension in the direction of its operative movement so as to provide twodlametrally opposed narrow portions 5I and two diametrally opposed wide portions 5 2. The narrow portions 5t, as shown in Flg. 2, have, in the direction of movement of the closure, a dimension these closures 49 and 50 are rotated' through an" angle of 90 from the positions in which they are shown in Fig. 2, the wide portions 52 thereof may be brought into positions wherein they will com pletely close the ports 45 "and 41 when the valve means 42 is in neutral position. A

When the closures 49 and 5U are in the positions thereof shown in Fig. 2, hydraulic iluld will tlow from the inlet port 4| to the outlet port 42. this flow passing, as indicated by arrows 53, across the mouths of the service ports 45 and 41 across the faces of the narrow portions 5I of the closures 49 and 50. When the valve means 4l is shifted downward, as a result of rlghtward movement of the handle I3, the closure 5Il'will be moved into aposition obstructing the ilow of fluid from the space -between closures 49 and I9 into the ports 41, and at the same time the clomre 49 will be moved downward with relation to the ports 45 to obstruct flow of nuid from the ports 45 .to the lower outlet or return port 42, the result being that the uld fed into the space between the closures 49 and 5lcan iind exit only through the ports 45 and therefore will be directed into 'cylinder 28. The uld in the leftward side of the cylinder 25 can then now through the delivery piplng 31 to the ports 41, opened to permit ilow into the outlet port 42 by the downward motion of the closure 5l. It will be understood that upward movement of the valve means 4l willproduce a movement of the closures 4l and 50 whereby nuid will be caused to ow out through the ports 41 tothe delivery piping 31, now also being permitted from the delivery piping 35 into 43 mustbemoved inordertoproduceanowof pressure nuid out through a selected service port means43or44. This,in`turn,isdetermlned by the dimension o2 the face of the portion .of the closure presented tothe valve port, as compared to the dimensionof theportinthedirectionof -the movement of the closure. My invention provides means whereby the closures 49 and 5I may bemovedtransverselytothedirectionoftheir movement, in this instance, circumferentially. so as'to bring into cooperative relation to the valve ports diiferent and wider portions of the closures 4l and 5l. It is therefore possible by rotation of the closures 43 and 5I to bring intoalignment with the valve ports 45 and 41 dlll'erent sections and accordingly different face dimensions o! the control valve 2l is axial. It is connected to valve means 48 and axially moves such valve means 4I within the body 3l in accordance with the moveclosures 4l and Il. whereby the eilecilve faces of the closuresl presented to the valve pork will "be less than'equal toorgreater thanthe axial 2,sso,7os

i dimensions of the ports, within the llimitations l and variations ofthe closures 49 and 50,

'Ihe closures 49 and III are respectively mounted on sleeves 69 and 8| which are movable 'with relation to an axial rod. The sleeves 69 and 6| are provided with means of interengagement permitting axial movement thereof, but preventing rotation so that the closures 49 and 50 will be heldin alignment. Near its lower end, the rod 62 has a threaded portion in engagement with the sleeve 69, and the downwardly projecting end of the rod 62 is provided with an engageable formation such as a nut '66, whereby rotation may be imparted tothe rod. Below the threads 65 sealing means 61 is `shown around the rod 62. The upwardly projecting portion of the sleeve 6 I, which forms a cooperative part of the valve actuating means, has aicollar 19 thereon which is received in an annular cavity 1| in an attachmenttting 12 having a projecting portion 13 for connection to the levei- 30, Fig. 1. The upper portion of the rodl 62 has threads 15 for engage-- ment with the sleeve 8|, these threads 15 being of different pitch than the threads shown at 65 so that by rotation of they rod 62, the sleeves 60 and 6| and the closures 49 and 59 may be givenv adjustment of the closure spacing while the valve is in use without interference with its other funcf tions. It is an object of this invention to provide `a control valve for use in operating mechanisms wherein the adjustable features herein described maybe used in'connection with valve or other motions to vary the supply of fluid during valve and 'an f the body sa. This 1 accomplish by forming flanges or pistons 81 and-'88 on the sleeves 6| and GII in spaced relation to the end walls 39 movements in accordance with predetermined requirements by means of rotation of closures 49 -and 50 during a valve motion and/or variations rotation of the screw 8| the valve means may be rotated so that rotative adjustment of the closures 49 and 50 relative to the ports 45 and 41 may be readily accomplished from the exterior of the selector valve and without necessity of dis` mantling any portionof the valve. This makes it possible to adjust the sensitivity or characteristics of operation of the valve while it is connected in place in a hydraulic system and in actual use.

In Figs. 2 and 4 I have shownfclosures 49 and 50 varying gradually in dimension from the nar` row portions 5| to the wide portions 52 thereof. Although it might be regarded as preferable, this gradual variationl in dimension of the closures may be in some instances in the use of the control valve, replaced by a stepped formation such as shown in Fig. 5. Therein I have shown a closure member 49' having narrow sections 5I' and wide sections 52' with intervening sections 52a of different width in stepped arrangement .between the small and large sections 5I and 52'.

A feature of my invention resides in the provision of fluid chambers 85 and 86 between the ends of the valve means 48 and the end walls 39 and 49. These uidchambers may be employed in some instances as dash pots for control of the rate of movement of the valve means 48, but they have a special utility as means whereby reacting fluid pressure may be applied through the valve means and the lever 3Il to the upper portion or handle I3 of the control member IIJ. In Fig. 1 I have shown a branch pipe 99 connecting the delivery piping 36 with a port 9| which communicates with the lower chamber 86. When the handle section I3 is moved rightward so as to actuate the selector valve 28 in a manner to deliver uid under pressure through the piping 36 .into the rightward end of the cylinder 26, the

iiuid pressure in the piping 36 will be transmitted through the branch pipe to the chamber 86 wherein it will exert an upward force against the piston 88, this upward force being transmitted through the valve means 48, the valve-actuating means 29, and the lever 30' to the handle section I3, thereby producing a force tending to move the handle leftward against the operating force applied rightwardly thereto by the operator. lThis force, referred to as load feel, will be proportionate to the forcev exerted against the larger piston 25 within the cylinder 26 in accordance with the ratio of the areas of the pistons 88 and 25v multiplied by the ratio of the length of the lever 39 to the length of the handle section I3. In like manner, I have shown the branch piping connecting the delivery piping 31 to a port 96 which communicates with the upper chamber 85, so as to produce against the upward face of the piston 81 a force similarly proportionate tok `this particular arrangement, with one-sixth the manual effort on the handle section I3 as would be required if the lever III were not equipped with the hydraulic follow-up control. This ratio of eiort can be varied withinwide limits;l in some instances an increase of required effort on the handle section |3 over that secured on the piston 25 might be desired. It will be understood that the illustration of the pistons 81 and 88 as ofthe same diameter as the closures 49 and 50 is for descriptive purposes only; design requirements may require larger or smaller diameters of the pistons 81 and`88, with correspondingly increased or decreased diameters of the valvel body 38 bei with movements of the handle section |3` causing proportionate movements of the piston 25 with proportionate loadings on the handle section I3 to those exerted on the piston 25. This feature makes possible manual control of the part I9 over short distances with provisionfor use of hydraulic power for larger changes of position of the part I9; rotation of the closures providing an, adjustment of the amount of manual control secured before hydraulic power is used. By constructing wider portions of the valves of sumcient width w overlap the service ports throughout the motion permitted by the stops to limit motion of the handle section Il, provision is had for limiting the motion ofthe mechanism, by rotation ofthe valves, to that of the operation permissible by motion of the handle section Il. If an external force be exerted on the part I9 of sumcient magnitude to create a pressure on the handle section I3 that is greater than the operator can hold or, ln case of .the operator not holding the handle section I3 and the application of a force to the part.I!I of suflicient intensity to overcome the friction of the mechanism, the handle section Il will be forced in the direction of such' force, actuating the control valve 28 to permit movement f of the piston 25 in the direction in which the external force on the part I9 tends to move it. This action can be applied, for instance, to the hoist control lever of a crane, making it impossible for an operator to lift a load of suillcient weight to` overturn the crane. The use of load feel in connection with hydraulic follow-up or booster controls requires that the operator must hold a proportionate part of the forces exerted on or acting upon the controlled part at all times. The system herein described is reversible; if the operator does not hold the handle section I3, forces acting on the part I9 will cause motions of the part I9 in the direction of the acting forces. The design of mechanism for use of this valve should take into account the desired relationships of the forces to act on the pistons 25 and 81 and 88 in order to limit thesforces on-the handle section I3 to those desirable for operation by correct proportioning of the areas of the pistons 25, 81 and 8B.

lI claim as my invention:

1. In a control valve of the general class described, the combination of a body having therein spaced pressure and return ports, and a pair of service ports disposed between said first named ports; actuating means extending within said body; a pair of valves disposed so as to simultaneously cooperate with said service po'rts'and simultaneously vary the flow through said service ports, said valves receiving yoperating movement from said actuating means, and each of said valves having a piston-like portion dened and bounded by a pair of shoulders extending radially of' said body from said actuating member, said shoulders being spaced apart in the direction of operative movement of said actuating means, said spacing of said shoulders varying in dimension in the direction of the operating movement of said valves by said actuating means; and adjusting means for moving said valves in a direction transverse to the said direction of their operating movement by said actuating means whereby portions of said valves of diierent aseonbo actuating means; adjusting means for moving Vsaid valves in a direction transverse to the said'` direction of said operating movement by said actuating means whereby said varying dimensions of the service port coverage thereof may be brought into coperating relation to said service ports; and means.k for eil'ecting relative 'movement of said valves. s

3. In a. control valve of the general class described, the combination of: a cylindric body having therein spaced pressure and return ports, and a pair of service ports disposed between said' pressure and return ports; actuating means extending within said body; a pair of valves, to cooperatewith said service ports, said valves being structurally connected to said lactuating means; a driven member on said actuating means; driving means engaged with said driven member for normally restraining rotation of said valves and for operation on occasion to rotate said valves about their axial line of operating movement;

width may be brought into cooperating closure relation to said service ports.

2. In a control valve 0f the general class described,4 the combination of a bodyl having therein spacedA pressure and return ports, and a pair of service ports disposed betweenl said first named ports; actuating means extending within said body; a pair of valves disposed lto v simultaneously cooperate with said servicev ports,

said valves receivingoperating movement from said actuating means, and said valvesvarying in dimension of service'port coverage in the direction of their operating movement by said and means for simultaneously effecting relative movement of said valves in equal amounts but in opposite directions by means extending outside said valve body and operable from a single control while said valve actuating means is in motion or at rest. l

4. In a controll valve of the general class described, the combination of a body having therein spaced pressure and return ports, and service ports disposed between said ilrst named ports, said service ports including a pair of diametrally placed first .service ports and a pair of `diametrally placed second service ports; actuating means extending within said body; a pair of valves to simultaneously cooperate with said service ports and simultaneously vary the flow through said service ports, said valves receiving operating movement from said actuating means, each of said valves having a plurality of diametrally opposed sections, each of which sections. varies in dimension in the directionof the operating movement of said valves by said actuating means; and adjusting means for moving said` valves in a, direction transverse to the said direction of their operating movement by said actuating means whereby diiierent sections thereof may bebrought into cooperating relation to said service ports.

5. In a control valve of the general class de-v scribed, the combination of a body having therein spaced pressure and return ports, and service ports disposed between said first named ports, said service ports including a pair of diametrally placed rst service ports and a pair of diametrally placed second service ports; actuating means extending within said body; a pair of valves to simultaneously cooperate with said service ports and simultaneously v"ary the ilow through said service ports, said valves receiving operating movement; from said actuating means, each `of -said valvesphaving a plurality of diametrally opscribed, the .combination of a valve body;.valve actuating means extending therein, said actuating means being movablein opposite directions from a neutral position 4 along a prescribed direction of movement to accomplish valve actuating movement, and said body vhaving therein a pair of ports spaced apart in said direction of valve Iactuating movement, and a service port between said viirst named ports; a valve in said 'body connected to said actuating means so that when said actuating means is in said neutral position said valve will be aligned with said service port and being lmovable by said actuating means in. said direction of movement between positions of alignment and disalignment with said service port, said valve dividing said valve body into a pair of chambers and being defined `by a pair of outwardly faced shoulders spaced apart in the direction of operative movement of said actuating means, the spacing of said outwardly faced shoulders varying in dimension in the direction of movement; and means for moving said valve transversely to said direction of said operative movement whereby different portions of said valve will be brought into cooperating relation to said service port,`4 thereby varying the ow through said serviceQport for a given movement of said valve.

'7. In a control valve of the general class described, the combination of: a cylindric vbody having pressure and return port. means comprising .an intermediate port and a pair of end ports, and a pair of service ports disposed on opposite sides of said intermediate ports and between said intermediate ports and said end ports; valve actuating means movable in a direction axially of said body; valve means in said body comprising a pair of closures, spaced apart so as to simultaneously cooperate one each with a separate one of said service ports, said valve means being movable by said actuating means in opposite directions from a position wherein said closures are simultaneously cooperatively aligned with said service ports, and each of said closures having a piston-portion defined and bounded by al pair of oppositely facing surfaces spaced lapart in the direction of operative movement of said actuating means, the spacing of said surfaces varying in dimension parallel to the axis of said body; and adjusting means for rotating at least one of said closures relatively ports; valve actuating means movable in a direc-I tion axially of said body; valve means in said body'comprising a pair of closures spaced apart so as to simultaneously cooperate, one each with a separate one of said service ports, said valve means being movable by said actuating means in opposite directions from a position wherein said closures are ysimultaneously cooperatively aligned with said service ports, and said closures varying in dimension parallel'to the axis of said body; and adjusting means for rotating said valve means relatively to said body so as to bring different width portions of said varying dimensions closures into positions of. cooperation with said service ports.

9. In a control valve of the general class described, the combination of: a cylindric body having pressure and return port means comprising an intermediate port and a pair of end ports, and a kpair of service ports disposed on opposite sides of said intermediate ports and between said intermediate ports and Isaid end ports; valve actuating means movable in a direction axially of said body; valve means in said body comprising a pair of closures spaced apart so as to simultaneously cooperate, one each with a separate one of said service ports, said valve means being movable by said actuating means in opposite directions from apostion wherein said closures are simultaneously cooperatively aligned with said service ports, and said closures varying in dimension parallel to the axis of said body; adjusting means for rotating at least one of said closuresrelatively to said body so as to bring different portions of said closure into cooperation with Iat least one of said service ports; and adjusting means for simultaneously varying the axial spacing of said closures.

10. In a control valve of the general class described for connection to the fluid receiving spaces of a uid operated device, the combination of: a cylindric body having pressure and return port means comprising an intermediate port and a pair of end ports, and a pair of service ports disposed on opposite sides of said intermediate port and between said intermediate port and said end ports; Yvalve actuating means movable in a direction axially of said body; valve means in said body comprising a pair of closures, one each of which cooperates with a separate one of said service ports, said valve means being movable by said actuating means in kopposite directions from a position wherein said closures are aligned with said service ports, and said closures varying in service port coverage dimension parallel to the axis of said body; adjusting means for rotating said closures to vary the coverage of said service ports by said closures; pistons on said valve means between said end ports and the end walls of said bodiy to form chambersv at the ends of said valve means to receive fluid; and means for transmitting varying fluid pressures. from said uid receiving spaces of said uid operated' device respectively to said chambers at the ends of said valve body.

. 11. In a selector valve of the general class described, the combination of: a cylindric body having pressure and return port means comprising an intermediate port and a pair of end ports, and a pair of service ports disposed on opposite sides of said intermediate ports and between said intermediate ports and said end ports; valve actuating means movable in a direction axially of said body; valve means in said body comprising a pair of closures, one each of which cooperates with a separateone of said service ports, said valve means being movable by said actuating means in opposite directions from a position wherein said closures are aligned with said service ports, and said closures varying in dimension parallel -to the axis of said body; adjusting means for rotating at least one of said closures relatively to said body so as to bring different portions of said closure into cooperation with at leastone of said service ports; pisof said service ports with a separate one of said chambers. y

12. In a control valve of the general class described. the combination of: acylindric body having flow port means comprised ofA an intermediate portV or ports and a pair or pairs of end ports, and a pair or pairs of service ports disposed between said intermediate ports and said end ports; valve actuating means movable in a direction axially of said body; valve means in said body comprising a pair oi closures simultaneously cooperatively aligne( with said 'service ports, at least one of said closures having one or more sections, eaclof which `said sectionsvaries in dimension of service port coverage in.

a direction parallel to the axis of said body. each of which said variable dimension of service port coverage sections cooperates with a. separate one of said service ports, said valve means being movable by said actuating means in oppomieJ csimrrcm: or comemos.

Patent lio. 2,580,705.`

RALPH R. traceren.

July 51, 19145,-

It is hereby certified that error appears in the print specification of iiie above numbered patent requiring correction-as'follows:- Page 5, f'irst column, line 22', colsim A6, strike out the wordsfseidvoperetive" end'insert "movement" 1n line ao', me clam; vum tutti um Letters the seme before Patent shou1d-`be read with this correction thereinl thltthe same nay conform to the record of the oase in .the'Patent Office.

signed and-tulsa this 16th any er october, A. n, 1 9ir5.

(Seal) Leslie Frazer First Assistant Gnnissioner et Patents.

of said service ports with a separate one of said chambers. y

12. In a control valve of the general class described. the combination of: acylindric body having flow port means comprised ofA an intermediate portV or ports and a pair or pairs of end ports, and a pair or pairs of service ports disposed between said intermediate ports and said end ports; valve actuating means movable in a direction axially of said body; valve means in said body comprising a pair oi closures simultaneously cooperatively aligne( with said 'service ports, at least one of said closures having one or more sections, eaclof which `said sectionsvaries in dimension of service port coverage in.

a direction parallel to the axis of said body. each of which said variable dimension of service port coverage sections cooperates with a. separate one of said service ports, said valve means being movable by said actuating means in oppomieJ csimrrcm: or comemos.

Patent lio. 2,580,705.`

RALPH R. traceren.

July 51, 19145,-

It is hereby certified that error appears in the print specification of iiie above numbered patent requiring correction-as'follows:- Page 5, f'irst column, line 22', colsim A6, strike out the wordsfseidvoperetive" end'insert "movement" 1n line ao', me clam; vum tutti um Letters the seme before Patent shou1d-`be read with this correction thereinl thltthe same nay conform to the record of the oase in .the'Patent Office.

signed and-tulsa this 16th any er october, A. n, 1 9ir5.

(Seal) Leslie Frazer First Assistant Gnnissioner et Patents. 

